{"paper":{"title":"The Evolution of the Kinematics of Nebular Shells in Planetary Nebulae in the Milky Way Bulge","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.GA"],"primary_cat":"astro-ph.SR","authors_text":"D. M. Clark, E. D\\'iaz-M\\'endez, J. A. L\\'opez, Ma.-T. Garc\\'ia-D\\'iaz, M. G. Richer, M. Pereyra","submitted_at":"2010-04-28T07:58:49Z","abstract_excerpt":"We study the line widths in the [\\ion{O}{3}]$\\lambda$5007 and H$\\alpha$ lines for two groups of planetary nebulae in the Milky Way bulge based upon spectroscopy obtained at the Observatorio Astron\\'omico Nacional in the Sierra San Pedro M\\'artir (OAN-SPM) using the Manchester Echelle Spectrograph.  The first sample includes objects early in their evolution, having high H$\\beta$ luminosities, but [\\ion{O}{3}]$\\lambda 5007/\\mathrm H\\beta < 3$.  The second sample comprises objects late in their evolution, with \\ion{He}{2} $\\lambda 4686/\\mathrm H\\beta > 0.5$.  These planetary nebulae represent evo"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1004.4971","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}